/Engine/Source/Runtime/Landscape/Classes/LandscapeProxy.h
Deform landscape using a given spline
void EditorApplySpline ( [USplineComponent](API\Runtime\Engine\Components\USplineComponent) * InSplineComponent, float StartWidth, float EndWidth, float StartSideFalloff, float EndSideFalloff, float StartRoll, float EndRoll, int32 NumSubdivisions, bool bRaiseHeights, bool bLowerHeights, [ULandscapeLayerInfoObject](API\Runtime\Landscape\ULandscapeLayerInfoObject) * PaintLayer, [FName](API\Runtime\Core\UObject\FName) EditLayerName )